Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
| Autor: | Nakayama, K., Sato, T., Richard, P., Xu, Y. -M., Sekiba, Y., Souma, S., Chen, G. F., Luo, J. L., Wang, N. L., Ding, H., Takahashi, T. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | EPL 85, 67002 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/85/67002 |
| Popis: | We have performed high-resolution angle-resolved photoemission spectroscopy on the optimally-doped Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ compound and determined the accurate momentum dependence of the superconducting (SC) gap in four Fermi-surface sheets including a newly discovered outer electron pocket at the M point. The SC gap on this pocket is nearly isotropic and its magnitude is comparable ($\Delta$ $\sim$ 11 meV) to that of the inner electron and hole pockets ($\sim$12 meV), although it is substantially larger than that of the outer hole pocket ($\sim$6 meV). The Fermi-surface dependence of the SC gap value is basically consistent with $\Delta$($k$) = $\Delta$$_0$cos$k_x$cos$k_y$ formula expected for the extended s-wave symmetry. The observed finite deviation from the simple formula suggests the importance of multi-orbital effects. Comment: 4 pages, 3 figures, 1 table |
| Databáze: | arXiv |
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